Tool for installing tubular rivets



July 9, 1946. w. G. MITCHELL TOOL FOR INSTALLING TUBULAR RIVETS.

3 Sheets-Sheet 1 Fild June 11, 1945 July 9, 1946.

w. G. MITCHELL v 2,403,675

TOOL yFOR INSALLING TUBULAR RIVETS Filed Jup? 11, 1943 3 Sheets-Sheet 2 JNVENTOR. @d

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July 9, 1946- w. G.' MITCHELL 4032675 TOOL FOR INSTALLING l'LUBULR RIVETS Filed June,11, 1943 s sheets-sheet :s

' ATroR/vfx .Patented July 9,

'UNITED STATI-:s PATENT OFFICE TOOL FOR INSTALLING TUBULAR RIVETS Walter George Mitchell, Aurora, Ill., asslgnor to Independent Pneumatic Tool Company, Chicago, Ill., a corporation of Delaware Application June 11, 1943, serial No. 490,546

22 Claims.

` l This invention relates to power operated tools for installing internally threaded tubular rivets for blind riveting operations in airplane and other work.

The principal object and purpose of my invention is to provide a simple and eiiective portable power operated hand manipulated tool for inwardly of the tool support by the power means of the tool when engaged against the rivet in the work imparts movement to the spindle and the support relatively to the anvil to collapse or upset the rivet engaged by the spindle;

To provide a tool structure in which the power operated motor means employed for respectively rotating the spindle and pressing the anvil outwardly of the tool support against the rivet are selectively controlled by a single control means operable by the operator holding the tool to simplify and facilitate the handling and manipulation of the tool;

To provide the control means in the form of a single rotary member movable into a number of successive rotative positions to control the operation of the tool motors in the desired cycle, to wit, to rotate the spindle to engage the rivet, topress the anvil against the rivet in the riveting stroke of the tool, and thereafter rotate the spindle in reverse to release the spindle from the collapsed rivet and return the power means to the start of the riveting stroke;

To provide the control means with a single actuating lever which by a ratchet or equivalent mechanism enables the control member to be turned through said respective .rotative positions in the successive operations of the lever;

-To provide a signal device in the tool structure for indicatingto the operator when the riveting stroke of the tool has been completed;

To provide a switch mechanism for the signal device and which switch mechanism is operable in the riveting stroke of the tool at the terminus thereof;

To provide an adjustment in the tool whereby the riveting stroke of the tool may be adjusted 2 to control the amount of set or compression to be given to the rivet in upsetting or collapsing the same; and

To provide an interconnection between the anvil and the lever of the riveting stroke producing mechanism of the tool to prevent rotation of the anvil with respect to the rivet.

The invention consists further in the features of structure hereinafter described and claimed.

In the accompanying drawings- Fig. 1 is a longitudinal sectional view with parts in elevation of a riveting tool constructed in accordance with my invention;

Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1;

Fig. 2A is a. sectional ,view taken on line 2A-2A of Fig. 1 to show details of construction to be later described;

Fig. 3 is a cross-sectional view with parts in elevation taken on line 3--3 of Fig. 1 to show the actuating mechanism for the rotary control valve of the tool;

Fig. 4 is an end view of said control valve to show the ratchet arrangement thereon;

Fig.- 5 is a sectional View taken on the lcurved line 5--5 of Fig. 4 to show the step-shaped grooves and the spring biased plunger engageable therewith;

Fig. 6 is .a cross-sectional view taken on line 6--6 of Fig. 3, part of the 'actuating trigger lever being indicated in broken lines;

Fig. 7 is a longitudinal sectional view with parts in .elevation showing the spindle in engagement with the threaded portion of the tubular rivet in the first step of connecting these parts;

Fig. 8 is a similar view of the same parts showing the rivet after being collapsed or upset by the tool;

Fig. 9 is a vsectional view of a detail of construction to be hereinafter described;

Fig. 10 is a cross-sectional view taken on line lll- I0 of Fig. 9;

Fig. 11 is a side view of the bushing for the rotary control valve;

Fig. 12 is a diagrammatic view indicating the passage arrangement in the tool construction for connecting the two pressure fluid responsive motors through the control valve; and y Figs, 13 to 16 inclusive are diagrammatic views illustrating thevarious rotative positions of the control valve in supplying pressure uid to the respective tool motors in the operation of the tool.

In the tool structure shown in the drawings,

preferably in the form of a casting shaped to 2,4.os,svs

3 provide a pistol grip type of handle 2 an'd a section 3 to house and mount the two motor elements 4, of the tool. 'I'hese motor elements 4. 5 are arranged one above the other in parallel and both in the embodiment shown are pneumatically operated. The upper motor element 4 which is of the rotary type is divided from the lower motor element Fs lwhich is of the reciprocable type by a wall section 6 providing a part of the frame casting as shown in Fig. 1. The live or compressed air required to operate the motor elements is supplied thereto under the control of a manually operable control valve l. rotatably mounted within the handle 2 below the lower motor element 5. The handle 2 is provided with an air supply passage 8 having a tapped opening 9 at the lower or butt end of the handle for connection with an air supply hose (not shown). The handle member 2 has a chamber I0 providing a reservoir from which a lubricating oil is fed into the air stream in the passage 8 through an oil feed regulator (not shown) mounted in a recess II in the handle wall which divides the air passage 8 from the reservoir chamber IIJ as shown in Fig. 1.

Bolted or otherwise rigidly secured to the front side of the frame section 3 is a tubular housing I2 enclosing theV operative parts of the machine on the front side of the frame and mounting a reaction member or anvil I3 at the extreme front end of the tool. The anvil I3 is cylindric in form and has a sliding t within a sleeve I4 which has a screw threaded connection with a bushing I5 fitted within a bore at the front end of the housing I2 .as-.shown herein. A spring biased detent pin I6 carried by the housing I2 and extending through the bushing I5` engages the sleeve I4 at a circle of teeth I1 thereon for holding the sleeve I4 against accidental turning. A helical spring I8 normally urges the anvil inwardly, said spring surrounding the anvil within the sleeve I4 and bearing against shoulders on said respective parts.

The motor element 4 is of the rotary type having a cylinder I9 fixed against rotation within the frame section 3 and a rotor 20 eccentrically mounted within the cylinder I9 as shown in Fig.

, 12./ The rotor contacts with the cylinder I3 carried by the rotor in slots therein as invmotory structures of this general type. The-'crescent screwed on the spindleis drawn against'the anvil The rotor 23 has shaft extensions 24, 24 at its opposite ends and these extensions serve to mount the rotor in ball bearing units 25, 25 incorporated in the motor structure as shown in Fig. 1. 'I'he motor has end. plates 26, 2l at the respective bearings and these end plates complete the motor cylinder as shown in Fig. 1. As there illustrated, the end plates have a doweled connection with the intervening cylinder element I3.

Located within the housing I2 is arivet engaging spindle or action member 21 slidably mounted at its forward end within the anvil I3 and connected `at its inner end with the rotor 2li for rotation thereby. In the embodimentshown, this connection is made through a' reducing gear drive 23 of the planetary type. The sun gear of this drive comprises gear teeth on the adjacent shaft extension 24 of the rotor 20 and planet gears 23, 23 on a carrier 30the planets 23 meshing with the sun gear and the internal teeth ci' a ring gear 3| of the drive as shown in'Fig. 1. The carrier 30 has a hub portion 321with which the inner end of the spindle 21 is connected for direct 'rotation thereby. This connection comprises a l noncircular:head 33 at the inner end of the spindle fitting in a complementary shaped recess in the hub section 32 and clamped therein by a clamp nut 34 through which the spindle extends.

The motor assembly 4 and its drive 25are locked in place within the handle section 3 against The motor element 5 is of the reciprocating type having a cylinder' 35 and a contained piston 35..

The l-atter'is-secured-to a piston'rod 31 which extends into the housing I2 throughvthe A'i'ront header 33 of the cylinder 35, said'header constituting an mtegralwall portion of the frame casting Iy as shown herein. Theopposite or rear end of the cylinder as is closed by a cap elementv Y.

39, which also closes the mounting for the motor element '4. secured in place by bolts or screws 43 f shaped'chambers provide for the expansion and exhaust, respectively, of the live air'- suppliedto the motor 4 and control its rotation. in reverse di-v rections.

Th'e ports for admitting and exhausting pressure fiuidto and from the rotor cylinder, I9 are shown at 22, 23, respectively,- mrig. 12. when the rotor 20 is rotated towards the right or clockf wise as viewed in Fig. 12. the pressure fluid is 23. The rotor is rotated in this righthand direction to screw the spindle or action member to be later described into the threaded portion ofthe tubular rivet to be installed. A reverse rotation of the rotor 20, that is counterclockwise to release the rivet, is accomplished by .admitting pressure fluid at the port 23 and. exhausting it at the port 22. This is under the control of the valve I as will be later described. As will be noted in Fig. 12, the motor element 4 is of relatively light power, four blades being employed, so that the rotor will stall easily as soon as the rivet being as indicated inFig. 1.

Located .within the housing. I2 is apower actuated lever 4I fulcrumed at 42 on the housing I2 between integrallug elements 43, '43 'cast integral with the housing'` adjacentto its front end. The

lever 4I is comprised of angularly disposed arm portions 44, 45, the former' extending from the fulcrum 42 to the powerr delivering end 45 of the lever 4I and which power delivering end 45 engag'es the inner end of the anvil I3 in a slot therein to be later described. An extension I3c of anvil ,I3 provides an extended surface to thev bottom of this slot. The arm portionv 45 o! the lever 4Ijextends rearwardly from the fulcrum 42 and has an underlying cam vsurface -4'! which in the normal position of the lever 4I' at the start of a riveting stroke is in angular relation to the piston rod 31. The latter. extends between the lever arm 45 and a co-operating track-way 43 secured by screws 43 to the housing I2 below the lever arm 45 as shown in Fig. 1.

The piston rod 3 1 carries a driving head 50 at its outer end between the lever arm 45 and the track-way 48. Said driving head is bifurcated having side walls 5I,` 5I between which are journaled upper and lower rollers 52, 52 on axis orv shaft elements 53, 53 as 'shown in Fig. 2.. Said axis elements 5 3 extend through spacer plates 54, 54 located between the side wallsll to hold the rollers 52 in contact with the cam surface 41 and the track-way 46, respectively, and out of peripheral contact with each other.r The axis elements 53 extend through vertically elongated slots 55 in the walls 5| of the driving head to /compensate the roller action to any variation of the spacing between the cam surface 41 and the track-way 49. The shaft elements 53 are locked in place and the' lever 4| is provided in its upper portion with a channel orgroove 56 to accommodate the spindle 21 whereby the power delivering `.end 46 of the lever 4| may straddle the spindle and apply power approximately along the center line of the anvil I3.

The control valve 1 is in the form of a cylindric member rotatably mounted within a complementary' shaped bushing 51 stationarily fitted within the handle 2 at the location for the valve.

The forward end of the valve 1 is flanged at 58r to overlie the adjacent end of the bushing 51 to hold the valve in place. This ange 58 has a complement of peripheral ratchet teeth 59 engaged by a spring 60 to hold'thevalve from a reverse turning. The spring 60 is mounted in a housing section 6I secured over the front end of the valve 1 by one or more screw elements62 6| provides a chamber 63 in which the valve iiange 58 and the spring 60 are located. The

vIn the normal or starting positional the parts asshowninl'lg.1.thevalve1isinitsilrsto neutral position as detailed in Figs. 12 and 13.

At this time the piston 36 is at the forward end of the cylinder and the inlet port 11 in the valve bushing 51 and which port vconnects with the main supply passage I in the tool handle 2 is closed by the valve body asshown in Figs. 12 and 13-X and 13-C, the latter being taken on line C-C 'of Fig. 13--X. 'I'his cutsv oil the iiow of uve air to both of the tool 'motors 45. The

driving head 56. on the piston rod I1 is now at the Ythreaded portion 19 of the tubular rivet 86 as shown in Figs. 1 and 3. This housing section front end ofthis chamber is closed by a cover A plate 64 secured in piace by the screws 62.

Pivoted in the chamber 63 on a pivot pin 65 is trigger lever 66. The latter extends out' of the chamberv 63 through a slot 61 in the surrounding body portion 68 of the housing section 6|.

Beyond the slot 61, the trigger lever 66 has an A angular end portion 66a extending alongside the handle 2 to be within easy access for actuation and is provided at its outer end with a serrated thumb piece 69 as shown in broken-lines in Fig. 6. With the arrangement disclosed, the operator holding the tool may conveniently depress the trigger lever to turn .the valve 1 to its various positions for supplying pressure iluid to the tool motors in the sequence required for a rivet installing and compressing operation.

To turn the valve member from the trigger' leverl66, I provide a ratchet mechanism comprising an arm 10 pivoted to the inner end of the trigger lever and overlying the front end of the valve member within the housing chamber 63. A spring biased plunger 1| is carried at the lower or free end of the arm 10 and presses against the front end of the valve member 1 to co-act with a series of forwardly opening, arcuate guide grooves 12 as detailed in Figs. 4 and 5. The grooves 12 are arranged in a circle about the valve axis and have inclined bottom walls 13 interposed by shoulders 14 both of which provide a stepped formation for turning `the valve member 1 by the arm 10 on each depression of the f to be installed and collapsed by thetool.

In establishing the foregoing connection, the rivet is held by the operator between the fingers of one hand and applied over the threaded end 18 of the spindle, the latter being inserted into the tubular stem 9| oi' the rivet through its taigeaded end 16 outer anged end I2 until the of the spindle engages the thre ed portion 19 of the rivet. Now, the operator holding the rivet against turning depresses the trigger lever 66 to turn 'the valve 1 its first quarter turn into the position shown in Fig. 14. 'I'his connects the ports 11 and 83 'in the bushing 51 through a recess 84 in the valve member and live air is 'supplied to the rotary motorthrough its port 22 to rotate the spindle-21 to screw the same into the threaded portion 19 in the tubular rivet. 'Ihe operator holds the rivet until the threaded connection draws the iianged end 62 ofthe rivet against the anvil '|3. The` latter due to its interconnection with the lever 4| is held against rotation and the motor stalls and ceases to revolve when the rivet is brought against the anvil Il.

The interconnection just above vmentioned, comprises the co-action of the sides of the lever 4| at its power delivering end 45 with the sides |3a, |3a of a milled slot |317 in the anvil 'I3 at its inner end as detailed in Fig. 2A. As shown in Fig, 1, thebottom of the slot |317 is curved for ease of movement of the lever against the inner endV of the anvil I3.

When the valve] is in its rst and second rotative ,positions just above described and 'as shown in Figs. 13 and 14, the valve body closes the bushing port 85 and live air is cut oil.' to the casing passage 66 which connects the bushing port 65 with the forward port 81 at the front end of the cylinder 35. Live air may enter the rear end of the cylinder from the.bushing port 83 through the rear port 88 in the cylinder and the interconnected casing passages 89, 96 which connect the bushing port 83 with the motor ports 2.2 and 88, respectively, as shown in Fig. l2. This, however, does not affect the position of the piston 36 in the cylinder 35 for the reason that said piston is at the frontendof the cylinder at the limit of its return stroke. Motor port 23 is connected at this time to the exhaust through bushing ports 9|, .92 and the intervening recess 93 in the valve body 1 as shown in Figs. 13-D andV 14-D, respectively. Port '23 is connected with the bushing port 9| by a passage 94 in the tool casing.

7 After the rivet .80 has been engaged with the spindle 21 and seated against the outer end of the anvil I0, the rivet is inserted byl the tool into the registering openings 95 inh the plates o'r parts 96. 95 to be riveted and clamped together as shown in Fig. 8. This is done from the ac-v cessible or outer side ofthe assembled plates, and the oprator holding the tool presses the flanged end 82 of the rivet against the outermost of said plates. The latter which constituie the work are fixed against movement and resist this pressure. The operator then depresses'the trigger lever 68 to turn the valve 1 into its third quarter position as shown in Fig. 15. Now, live air is supplied -ln unison rearwardly in respect to the anvil to collapse the tubular' stem 8| of the rivet against the innermost of the plates as indicated at' 01 in Fig. 8. It will be noted that the rivet stem is y collapsed in its portion between the innermost plate 90 and the threaded portion 19 of the rivet as engaged by the spindle 21. Theriveting pres. sure increases gradually as the cam surface 41 on the lever `'4| approaches parallelism-with the piston rod 31, `the'driving headI 0B being mcrvedv away from the fulcrum 42 of the lever and its power delivering end 46 on the riveting stroke.

With the valveY 1 in this third quarter position as shown in Fig. l5, it will be noted that the 8 unscrewed from the threaded portion 10 of the collapsed rivet andthe -tool is freed for the next rivet installing operation. The exhaust from the motor 4 is through the motor port 22, 8 9." bushing ports 00, 02 and valve recess 04. Some of this exhaust air which is still under pressure enters the cylinder port 00 through passage 90 and forces the piston 00 on its forward or return stroke to the starting position as shown in Fig. 1. The spring I8 maintains the lever 4| against the driving head 50 and when the trigger lever is again depressed to stop the reverse rotation of the motor 4 and the return stroke of the piston. the valve 1 is turned to its starting or neutral position as shown in Fig. 13. The tool is now ready for the next rivet to be installed and the operations -just above ldescribed are repeated in the order stated. l

Inthediagramsshowninli'igs. 13to18in elusive, it may bepointed out that the same pattern is followed throughout all of the figures. the sections being taken on section lines corresponding to those marked in'Fig. 13. It also may be remarked that the trigger lever 00 is depressed to its fullest extent oneach valve turning stroke. the trigger lever being returned to its star-tim position when released by the spring action hereinbefore mentioned;V

'I'he signal for the. tool comprises an electric lamp l90 mounted in theend cap 00 -of the tool in a cavity I behind a translucent cover |0|. The light bulb or the cover or both may be given a distinctive color,-for example red, to readily inlet port 11 is now connected with the bushing exhaust from the rear end of the cylinder 35 is through the cylinder port 88, casing xpassages 90 and 89, and valve lbushing ports 83 and 92 which are connected at this time by the port 04 in the valve member 1 as shown in Fig. 15-B.

Casing passages 90 and 89 are connected with. the' port 22 of therotary motor as shown in Fig. 12 and the exhaust air from the rear end of the cylinder 35 may enter the rotary motor through port 22. The rotary motor 20 is, however, at this time open to the exhaust port 92 through motor port 23, casing passage se, bushing port 9| and valve port 93 as shown in Fig. l5-D. The alternate path for the exhaust air precludes the possibility of the pressure being appreciably above atmosphcric .pressure and the rotary motor 20 is not turned to effect the screw threaded connection of the spindle 21 with the tubular rivet 8|. The bushing port 92 is connected to the atmosphere through an exhaust outlet (not shown) in the the bushing port lle-as shown in Figs. lS-X and 16-A. Inlet port 'il is now connected with the bushing port 9i through valve recess 93 as shown in Figs. l-X. iii-C and 1li- D and live air is supplied to the rot motor port 23. The rotor is now rotated in reverse andthe spindle 21 is call attention thereto whenl lighted. The lamp is grounded to the metal frame or tool. support I and isconnected by a wire |02 with adry-cell battery |00 located in a. chamber |04 provided 'therefor in the front casing li2 ofthe tool assembly. This chamber |04 is normally closed by a cover plate |00 fastened to the tool casing I2 and removable for battery replacement. The battery when inserted in 'thechamber |04 has its rear pole in electrical connection with a con- Y tact ||i6 mounted in an insulator |01 at the rear end o f the chamber and in contact with a. spring biased terminal |040 in an insulating sleeve |00 and to which terminal the conduction wire |02 is connected. 'I'his connection may also be made by extending the wire |2 into the space between the insulator disc m1 andthe sleeve |00 .and connecting the wire by a. terminal clip engaged by s. screw at the outer end of the contact plug |00.

Located at the front end of the chamber |04 is a telescopic cartridge ||0 of insulating material having a contact which is pressed against the forward terminal 2 of the battery. '111e coiled spring ||3 of the cartridge which performs this function seats against a metal cross-pin ||4 at the front end of? the cartridge and which pin has its opposite ends soldered to a contact ring |I5 carried by the cartridge in the path of a lug projection H6 at the inner end of the anvil l0.

W'hen the parts just above described are in their normal or starting positions as shown in Fig. l, the lug IIS isv out of contact with and spaced rearwardly of the contact ring lli and the electrical circuit to the lamp 00 is open. 0n a riveting stroke, when the plate H5 is brought into contactl with the lug H0, the lamp circuit is closed and the lamp is ignited. This indi- Cates t0 the operator that the riveting stroke of the tool is complete and that the rivet hasbeen collapsed or upset. The operator then depresses the trigger lever v66 to unscrew the spindle 21 from the rivet. It is to be understood, that the anvil I3 is of metal to complete the lamp circuit when the contacts IIS, IIB are engaged.A

The sleeve Il and the bushing I5 provide an adjustable mounting in the tool support so that the riveting stroke of the tool may beadjsted to determine the amount of set or compression given to thel rivet in upsetting the same. .This provides for proper upsetting of Ithe rivets to clamp'the plates together and avoids checking or cracking of the .folded metal in the upset portion 91 of the rivet from an excess of pressure from a longer than desired riveting stroke, this being essential because the upsetting action takes place on the inner side of the plates and is not visible to the operator in these blind riveting operations. The adjustment is made by screwing the sleeve I4 inwardly or outwardly to lengthen or shorten the riveting stroke. I'he length of the stroke is controlled by the spacing between the inner end of the sleeve Il and the lug IIB at the inner end of the plunger I3. Hence, by varying this spacing, the extent to which the lever 4I must be moved to upset a rivetmay be controlled. To facilitate turning the sleeve I4 for adjustment, its outer end Ita is fashioned to be engaged by a wrench or other turning instrument. Ihe sleeve I4 is made accessible for this purpose on unscrewing the cover cap I2a from the front end of the tool housing I2.

In all instances of anvil adjustment, the lamp circuit contacts H5, H6 follow the same spacing whereby the signal will go on at the terminus of the rivet-ing stroke. This follows from the fact that the headed end 'H1 vof the movable member I I 8 of the cartridge H0 follows valong with the sleeve I4 in adjusting the same. Failure of the lamp to ignite on a riveting stroke prompts the opera-tor to hol-d the tool against the rivet until the lamp signals a completion o f the riveting stroke. This insures properand effective rivet-- ing operations which in these blind riveting conditions are not visible to the operator.

The riveting tool of my invention is simple' in constructionv and operation and effective in installing and compressing these tubular rivets. 'I'he tool provides ample power for the upsetting operation and added to tlhis is the important fac- .tor of having a single control for operating both a swiveled connection with the support and ilxedv against endwise movement with respect thereto, said spindle extending through the anvil and having a threaded outer end for engagement with the threaded portion of the rivet, and means in the support for rotating the spindle and other means for projecting the anvil outwardly relatively to the support for vrespectively engaging and disengaging the spindle with respect to the rivet and collapsing the rivet engaged by the spindle.

having a swiveled connection with the support y and iixed against endwise movement with respect thereto, said spindle extending through the anvil and having a threaded outer end forening the spindle for engaging and disengaging vthe atively to the support to collapse the rivet en-' 2. A tool for installing internally threaded I same ywith respect to the rivet, and the other for projecting the anvil outwardly relatively to the support for collapsing the rivet engagedA by the spindle, and means for controlling the oper ation of said respective motor means.

3. A tool for installing internally threaded tubular rivets, said tool comprising a support, an anvil relatively slidably mounted in the support for engaging the rivet, a rotary spindle having a -swiveled connection with the support and fixed against endwise movement -with respect thereto, said spindle extending through the anvil and having a threaded outer end for engagement with the threaded portion of the rivet, a lever fulcrumed in the support, and means in the support for rotating the spindle 'and other means for pressing the lever against the. anvil for respectively engaging and disengaging` the spindle with respect to the rivet and projecting the anvil outwardly relatively to the support for collapsing the rivet engaged by the spindle.

4. A tool for installing internally threaded tubular rivets, said tool comprising a support, an anvil relatively slidably mounted in the support for engaging the rivet, a rotary spindle having a swiveled connection with the support and iixed against endwise movement with respect thereto, said spindle extending through the anvil and having a threaded outer end for engagement 'with the threaded vportion of the'rivet,

a lever fulcrumed on the support and having a y cam surface at its power receiving end, and two v power actuated means in the support, one for rotating the spindle and the other acting on the cam surface lof the lever for respectively engaging and disengaging the spindle with re;

spect to the rivet and pressing the lever against the anvil for projecting the same outwardly relgaged by the spindle.

5. VA tool for installing internally threaded tubular rivets, said tool comprising a support,

an anvil relatively slidably mounted in said support for engaging the rivet, a rotary spindle having a swiveled connection with the support and i'lxed against endwise movement with respect thereto, said spindle extending through the anvil and having a threaded outer end for engagement with the .threaded portion of the rivet, a lever fulcrumed on the support and having` a cam .surface at its power receiving end, a reciprocable -driving element in the support and acting on the cam surface of the lever for pressing the lever against the anvil for projecting the same outwardly relatively to the support to collapse the rivet engaged by the spindle, 4and two power operated means in the support, one for reciprocating the driving element and the other for rotating the spindle with respect to the rivet.

6. A tool for installing internally threaded tubular rivets, said tool comprising a support, an anvil relatively slidably mounted in the support for engaging thexrivet, a rotary spindle having a swiveled connection with the support and fixed against endwise movement with respect thereto, said spindle extending through the anvil and having a threaded outer end for engagement with. the threaded portion of the rivet, a lever fuls in A crumedon the support and having av cam surface at 'its power vreceiving end, a track-way on the support in .opposition to said cam surface, a

lreciprocable driving head in the support interposedbetween and acting on the track-way and the cam surface, respectively, when moved therealong away from the fulcrum for pressing the lever against the anvil to project the same outwardly relatively to the support to collapse the rivet engaged by the spindle, and two power operated means in the support, one for recipro' cating the driving head and-the other for rotating the spindle to engage and disengage the same with respect to the rivet.

7. A tool i'or` installing internally threaded tubular rivets,` said tool comprising a support, relatively movable action and reaction members mounted in said support, the action member. `being in the form of a rotary, spindle-having a mounted in said support, the action vmember being -in the form v of Aa' rotary spindIehaVing a threaded outer end for engagement with the threaded portion-oit the rivet, two pressure iluid responsive means in the support, one for rotating the spindle Vwith respect to the rivet, and the other for collapsing the rivet engaged by the spindle .by pressing on the reaction member to move the ,spindle and the support, relatively thereto, and `ineans for controlling the supply of pressure fluid to said respective pressure uid responsive means. A

9. A' tool for installing internally threaded `tubular rivets, said tool comprising a. support,. an -anvil carried thereby, a spindlemounted in the support and having rotation relatively to the anvil, said spindle having a threadedouter end for engagement with the threaded portion of the rivet,power actuated means in the support and havinga riveting stroke operable through the spindle'for collapsing the rivet engaged-by the spindle and the anvil, other means for rotating the spindle to engage and disengage the same Awith 'respect to the rivet, and electrical signal means on the support and operable in response to the riveting stroke of the tool on closing contacts in the signal circuit for indicating a completion of said stroke. j

10. A tool for installing internally threaded tubular rivets, said tool comprising a, support, an anvil carried thereby, a rotary spindle mounted in the support and having a threaded outer end :recaen relatively movable anvil and rotary spindle elements mounted -in the support. said spindle extending through the anviland having a'threaded outer end for engagement with the threaded portion of the rivet, power actuated meansy in the support for imparting relatively endwise movelment tothe anvil and the spindle for collapsing the rivet engaged by the spindle, other means for rotating the spindle with respectl to the rivet, and an electrical signal and ajswitch and circuit therefor in rthe support, comprising separable contactsfin the signal circuit on the support and the anvil, respectively, for closing the signal circuit at the terminus of the riveting stroke of the tool.

l2. A tool for installing internally threaded tubular rivets, said tool comprising a support, relatively movable anviland rotary spindle elements mounted `in the support, said spindle extending through the anvil and having a threaded outer end for engagement with-the threaded portion oi the rivet, power 4operated means in the vsupportior rotating thespindle with'respect to the rivet and other means iorcollapsing the rivet engaged by the spindle-:by imparting relative endwise movement to the anvil and the spindle in the riveting stroke of the tool, and means pro- Aviding a mounting `ior the anvil in the support comprising a sleeve threadedly connected therewithand housing a spring acting on the anvil, said sleeve acting for adjusting the length of said srotke to determine the set to be given to the r ve 13. A tool for installing internally Athreaded tubular rivets, said tool comprising a support,

vrelatively movable anvil and rotary spindle elements mounted in the support, said spindle'extending through the anvil and having a threaded outer end lfor engagement with the threaded portion vof .the-rivet, power actuated Ameans in the support for rotating the spindle with respect to the rivet and other means for collapsing the rivet engaged by the spindle by imparting relative f endwise movement to the anvil and the spindle iny the riveting stroke of the tool, said anvil being -spring biased in a sleeve threadedly mounted on the support, the threaded mounting of the sleeve permitting adjustent of the length of said stroke to determine the set to be given to the rivet, and a check device for holding the sleeve in its addusted positions. l

14. A tool for 'installing internally threaded tubular, rivets, said tool comprising asupport,

for engagement with the threaded portion of the rivet, power operated means in the support and having a riveting stroke operable through, the spindle for collapsing the rivet engaged thereby,

other means for rotating the spindle to engage the tool for indicating the completion of said stroke.

11.,A tool for installing internally threaded tubular rivets,vsaid tool comprising a support,

relatively movable anvil and rotary spindle elements in said support, said spindle extending through the anvil and having a threaded outer end for engagement with the threaded portion of,

the rivet, two pressure fluid responsive means in the support, one operating through the anvil for collapsing the rivet engaged by the spindle, and the other rotating the spindle relatively to the .rivet to engage and disengage the same, a single source of pressure iluid supply for both of said pressure fluid responsive means, and a single valve for controlling the supply of pressure fluid to said respective pressure fluid responsive means. s A

, l5. A tool for installing. internally threaded tubular rivets, said tool comprising a support, relatively movable anvil andv rotary spindle elements in the support, said spindle extending through the vanvil and having a threaded outer end for engagement with the threaded portion of the rivet, two pressure fluid responsive means in the support, one operating through the anvil for collapsing the rivet engaged by the spindle, and the other for rotating the spindle with respect to the rivet to engage and disengage the same, a single source of pressure iluid supply for both of said pressure fluid responsive means, a rotary valve in the support for controlling the supply of pressure uid to the respective pressure uid responsive means, and a single actuating member for turning said valve.

16. A tool of thecharacter dened in claim 15 characterized by the fact that the actuating means for the valve comprises a lever and a ratchet mechanism therefor in the support and on `the valve, respectively.

17. A tool of the character defined in claim 15 characterized by the fact that the actuating means for the valve comprises a lever on the support, a ratchet mechanism on the valve having ratchet teeth about the valve axis, an arm pivoted to the lever and overlying the portion of the valve provided with said ratchet teeth, and a spring biased plunger carried by the arm and co-acting with said ratchet teeth for turning the valve. f

18. A tool for installing` internally threaded tubular rivets, said tool comprising a support, relatively movable action and reaction members 'in the support, one of said members being in the form of a rotary spindle extending through the other memberand having a threaded outer said spindle extending through the anvil and" havinga threaded outer end for engagement with the threaded portionof the rivet, power operated means including a lever fulcrumed on the support for pressing the anvil outwardly relatively tothe support for collapsing the rivet en- -gaged by the spindle, other means for rotating 'Y the same with respect to the rivet and other end for engagement with the threaded portion of the rivet, two motor elements in the support, one for creating relative endwise movement between the action and reaction members for collapsing the rivet engaged by the spindle, and the other for rotating the spindle for engaging and disen-l gaging the same with respect to the rivet, a rotary, control means on the support for controlling the operation of said respective motor means, said control means having predetermined rotative positions for first screwing the spindle into the threaded portion of the rivet and then collapsing the rivet through the spindle and thereafter retracting the collapsing l means and unscrewing 1 means to upset the rivet connected with the spindle by imparting relativev endwise movement to the anvil and the spindle on the riveting stroke of the tool, and means for adjusting the length of said stroke to determine the setto be given to the rivet including coacting abutments on the support and the anvil, respectively, the spacing between'the abutments being varied to determine the length of said stroke.

21. A tool for installing internally threaded tubular rivets, said tool comprising a support, a sleeve threadedly mounted in said support, a spring biased anvil slidably 'mounted in said sleeve and normally projecting beyond the outer end of the same, a spindle revolubly and slidably mounted in the anvil and extending therethrough and connectible at its outer end with the threaded portion of the rivet to be upset by the tool, power actuated means in the support for rotating the spindle to connect and disconnect the same with respect to the rivet and other means to upset the rivetconnected with the spindle by imparting relative endwise movement to the anvil and the spindle in the riveting stroke of the tool, said sleeve and the anvil having coacting abutments to determine .the riveting stroke of the tool, and said sleeve having its outer end formed to be engaged for turning the sleeve relatively to the anvil to adjust the spacing between said abutments.

22. A tool of the character deiined in claim 21 characterized by the fact that a cap device fits on the support over the outer end of the sleeve and. that the anvil and spindle elements exten through said cap device.

WALTER GEORGE MITCHELL. 

